A polishing device for projector lens cover processing

By designing the cooperation between the spring and the extension rod, the problem of loose grinding caused by different material heights in the projector lens cover processing device was solved, achieving stable clamping and efficient grinding, and ensuring the complete removal of burrs on the material surface.

CN224407155UActive Publication Date: 2026-06-26UNKNOWN (SHENZHEN) TECH CO LTD

Patent Information

Authority / Receiving Office
CN · China
Patent Type
Utility models(China)
Current Assignee / Owner
UNKNOWN (SHENZHEN) TECH CO LTD
Filing Date
2025-06-03
Publication Date
2026-06-26

AI Technical Summary

Technical Problem

Existing projector lens cover processing devices have difficulty adjusting the height of the grinding section when dealing with materials of different heights, resulting in ineffective close contact and incomplete grinding of burrs.

Method used

A device including a grinding mechanism and a conveying mechanism was designed. Through the cooperation of a spring and an extension rod, the elasticity of the spring is used to push the grinding disc to make close contact with the material, and through the cooperation of a push rod and a pressure plate, the material is stably clamped to ensure that the material does not shake during the grinding process.

Benefits of technology

It achieves close contact grinding on materials of different heights, avoids burr residue, and improves grinding efficiency and effect.

✦ Generated by Eureka AI based on patent content.

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  • Figure CN224407155U_ABST
    Figure CN224407155U_ABST
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Abstract

The utility model discloses a kind of polishing devices of projector lens cover processing, it is related to projector processing technical field, the utility model includes protection box, the inner wall of protection box is equipped with discharge opening, the utility model is moved to the bottom of positioning ring by being equipped with spring and extension rod when placing plate is with unprocessed material, since the area of positioning ring is greater than positioning plate, therefore, positioning ring will be prior to top protective plate contact, so that top protective plate pushes connecting plate to make it push extension rod upwards and moves, and extrude spring inside hollow stem, push extension rod downwards using the elasticity of spring to make the close contact of the grinding disc bottom of connecting plate and material, so that grinding disc removes burr on the surface of material, reaches by the elasticity of spring let down moving extension rod makes grinding disc and material contact, prevent the problem that different height due to material, therefore polishing portion cannot effectively and material closely contact, prone to cause burr of material cannot be polished completely.
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Description

Technical Field

[0001] This utility model belongs to the field of projector processing technology, and in particular relates to a grinding device for processing projector lens caps. Background Technology

[0002] According to the published patent CN222520836U, a grinding device for processing projector lens caps is described. The driving assembly includes a drive motor fixed within a grinding table, a drive gear one coaxially fixedly connected to the output end of the drive motor, a drive rod rotatably connected within the grinding table, a drive gear two coaxially fixedly connected to the middle of the drive rod, the drive gear one meshing with the drive gear two, a pair of transmission bevel gears one coaxially fixedly connected to the drive rod, and a pair of drive screws rotatably connected parallel to each other within the grinding table. One end of each drive screw is coaxially fixedly connected to a transmission bevel gear two, which meshes with the transmission bevel gear one. The drive screws are threadedly connected to a conveyor frame. The drive motor drives a series of components to move the conveyor frame, thus realizing the conveying of the lens cap. This provides automatic conveying and grinding capabilities for the lens cap, improving overall efficiency and reducing workload. However, it still has the following shortcomings:

[0003] After completion, the above equipment simply positions and transports materials. Due to the different heights of the materials, it is too difficult to adjust the height of the grinding part, and it cannot effectively make the grinding part in close contact with the material, which easily leads to the problem that the burrs of the material cannot be completely ground off. Utility Model Content

[0004] The purpose of this utility model is to provide a grinding device for processing projector lens caps. By combining the grinding mechanism and the conveying mechanism, it solves the problem that the height adjustment of the grinding part is too difficult due to the different heights of the materials, and that it is not possible to effectively make the grinding part in close contact with the material, which easily leads to the incomplete grinding of the burrs of the material.

[0005] To solve the above-mentioned technical problems, this utility model is achieved through the following technical solution:

[0006] This utility model is a grinding device for processing projector lens caps, including a protective box, the inner wall of which has a feeding port and an outlet.

[0007] The inner wall of the protective box is provided with a polishing mechanism, which includes a motor. The outer wall of the motor is fixedly connected to the inner wall of the protective box. The output end of the motor is fixedly connected to a connecting shaft via a coupling. A worm gear is fixedly connected to the outer wall of the connecting shaft on the side away from the motor. Several worm wheels mesh with the outer wall of the worm gear. A hollow rod is fixedly connected to the top outer wall of the several worm wheels. The outer wall of the hollow rod is rotatably connected to the inner wall of the protective box. A spring is fixedly connected to the top of the inner wall of the hollow rod. An extension rod is fixedly connected to the outer wall of the end of the spring away from the hollow rod. The outer wall of the extension rod is slidably connected to the inner wall of the hollow rod.

[0008] Furthermore, a connecting plate is fixedly connected to the bottom outer wall of the extension rod, and a grinding disc is fixedly connected to the bottom outer wall of the connecting plate. A crown gear is rotatably connected to the inner wall of the protective box on the side away from the hollow rod. A gear meshes with the outer wall of the crown gear. The outer wall of the gear is rotatably connected to the inner wall of the protective box. A cleaning roller is fixedly connected to the outer wall of the gear. Pulleys are fixedly connected to the outer walls of both the hollow rod and the crown gear. A belt is driven through the inner wall of the pulley. A conveying mechanism is provided on the inner wall of the protective box.

[0009] Furthermore, the conveying mechanism includes a second pulley, the outer wall of the second pulley is fixedly connected to the outer wall of the connecting shaft, the inner wall of the second pulley is drivenly connected to a second belt, and the outer wall of the end of the second belt away from the second pulley is drivenly connected to a third pulley.

[0010] Furthermore, a threaded rod is fixedly connected to the outer wall of the third pulley, the outer wall of the threaded rod is rotatably connected to the inner wall of the protective box, a placement plate is slidably connected to the inner wall of the protective box, and several sliders are fixedly connected to the bottom outer wall of the placement plate.

[0011] Furthermore, the inner wall of the slider is threadedly connected to the outer wall of the threaded rod, the inner wall of the slider is slidably connected to a slide rod, the outer wall of the slide rod is fixedly connected to the inner wall of the protective box, and the top outer wall of the placement plate is fixedly connected to several positioning rings, and the outer walls of the several positioning rings are rotatably connected to positioning plates.

[0012] Furthermore, a gear-shaped knob is rotatably connected to the top outer wall of the positioning ring, and the outer wall of the gear-shaped knob is engaged with the outer wall of the positioning plate. A pressure spring is fixedly connected to the inner wall of the positioning ring, and a locking block is fixedly connected to the outer wall of the end of the pressure spring away from the positioning ring. The outer wall of the locking block is engaged with the inner wall of the positioning plate.

[0013] Furthermore, a top protective plate is fixedly connected to the top outer wall of the gear-shaped knob, a number of positioning blocks are fixedly connected to the inner wall of the gear-shaped knob, a push rod is rotatably connected to the outer wall of the number of positioning blocks, and a pressure plate is fixedly connected to the outer wall of the end of the push rod away from the positioning block.

[0014] Furthermore, a limiting groove is formed on the inner wall of the push rod, and a limiting block is slidably connected to the inner wall of the limiting groove. The outer wall of the limiting block is fixedly connected to the inner wall of the positioning ring.

[0015] This utility model has the following beneficial effects:

[0016] 1. This utility model incorporates a spring and an extension rod. When the placement plate moves with the unprocessed material to the bottom of the positioning ring, the positioning ring, being larger than the positioning plate, contacts the top protective plate first. This causes the top protective plate to push the connecting plate upwards, propelling the extension rod and compressing the spring inside the hollow rod. The spring's elasticity then pushes the extension rod downwards, ensuring close contact between the grinding disc at the bottom of the connecting plate and the material. This allows the grinding disc to remove burrs from the material's surface. The spring's elasticity enables the downward movement of the extension rod, bringing the grinding disc into contact with the material. This prevents situations where the grinding part cannot effectively contact the material due to varying material heights, thus avoiding incomplete burr removal.

[0017] 2. This utility model incorporates a push rod and a pressure plate. Rotating a gear-shaped knob moves multiple positioning blocks, which in turn move the push rod. During the push rod's movement, a limiting block inside the positioning ring slides along the limiting groove inside the push rod. Since the length of the limiting block is fixed and the push rod is arc-shaped, the limiting block can push the push rod to rotate around the positioning block. The rotation of the push rod then moves the pressure plate, clamping the material inside the positioning ring. This achieves the goal of using a gear-shaped knob to move the push rod and change the direction of the push rod's movement, thus clamping the material. This prevents the material from shifting unpredictably during grinding, where the grinding part needs to rotate at high speed. The simple fixing structure cannot secure the material firmly during this rotation, leading to poor die-cutting performance.

[0018] Of course, any product implementing this utility model does not necessarily need to achieve all of the advantages described above at the same time. Attached Figure Description

[0019] To more clearly illustrate the technical solutions of the embodiments of this utility model, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0020] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0021] Figure 2 This is a cross-sectional view of the grinding structure of this utility model;

[0022] Figure 3 This is a cross-sectional view of the main structure of this utility model;

[0023] Figure 4 This is a cross-sectional view of the conveying structure of this utility model;

[0024] Figure 5 This utility model Figure 4 Enlarged view of point A in the middle.

[0025] The attached diagram lists the components represented by each number as follows:

[0026] 1. Protective box; 101. Feed port; 102. Discharge port; 2. Grinding mechanism; 201. Motor; 202. Connecting shaft; 203. Worm gear; 204. Worm wheel; 205. Hollowed-out rod; 206. Spring; 207. Extension rod; 208. Connecting plate; 209. Grinding disc; 210. Crown gear; 211. Gear; 212. Cleaning roller; 213. Pulley; 214. Belt; 3. Conveying mechanism; 301 302. Second belt; 303. Third belt; 304. Threaded rod; 305. Sliding rod; 306. Sliding block; 307. Placement plate; 308. Positioning ring; 309. Positioning plate; 310. Gear-shaped knob; 311. Top protective plate; 312. Pressure spring; 313. Locking block; 314. Positioning block; 315. Push rod; 316. Pressure plate; 317. Limiting groove; 318. Limiting block. Detailed Implementation

[0027] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of the present utility model.

[0028] Please see Figure 1-5 As shown, this utility model is a grinding device for processing projector lens caps, including a protective box 1. The inner wall of the protective box 1 has a feeding port 101 and a discharging port 102. By opening the feeding port 101 and the discharging port 102 on both sides of the protective box 1, the operation process is determined and the operation is convenient.

[0029] The inner wall of the protective box 1 is equipped with a grinding mechanism 2, which includes a motor 201. The motor 201 is started, and its outer wall is fixedly connected to the inner wall of the protective box 1. The output end of the motor 201 is fixedly connected to a connecting shaft 202 via a coupling. A worm gear 203 is fixedly connected to the outer wall of the connecting shaft 202 away from the motor 201. The motor 201 drives the connecting shaft 202 to rotate, which in turn drives the worm gear 203 to rotate. Several worm wheels 204 mesh with the outer wall of the worm gear 203. The worm gear 203 drives the worm wheels 204 to rotate through the meshing of the worm gear 203. The top outer walls of the several worm wheels 204 are fixed. A perforated rod 205 is connected, and the outer wall of the perforated rod 205 is rotatably connected to the inner wall of the protective box 1. The rotation of the threaded rod 304 drives the perforated rod 205 to rotate inside the protective box 1. A spring 206 is fixedly connected to the top of the inner wall of the perforated rod 205. An extension rod 207 is fixedly connected to the outer wall of the end of the spring 206 away from the perforated rod 205. The outer wall of the extension rod 207 is slidably connected to the inner wall of the perforated rod 205. The extension rod 207 extends the connecting plate 208 to the moving length. When the cover moves to the bottom of the connecting plate 208, it pushes the connecting plate 208 and pushes the extension rod 207 upward, causing it to slide along the inner wall of the perforated rod 205. The spring 206 inside the hollow rod 205 is compressed, and the elasticity of the spring 206 increases the pressure of the connecting plate 208 on the cover. The connecting plate 208 is fixedly connected to the bottom outer wall of the extension rod 207, and the grinding disc 209 is fixedly connected to the bottom outer wall of the connecting plate 208. The pressure of the spring 206 pushes the connecting plate 208 to move, making the grinding disc 209 contact the cover more tightly. The inner wall of the protective box 1 away from the hollow rod 205 is rotatably connected to the crown gear 210. The outer wall of the crown gear 210 meshes with the gear 211. The engagement of the crown gear 210 and the gear 211 causes the crown gear 210 to drive the gear 211 to rotate. The outer wall of 11 is rotatably connected to the inner wall of the protective box 1. The outer wall of gear 211 is fixedly connected to a cleaning roller 212. The rotation of gear 211 drives the cleaning roller 212 to rotate. The outer walls of the hollow rod 205 and the crown gear 210 are both fixedly connected to pulleys 213. The inner wall of the pulley 213 is connected to a belt 214. The hollow rod 205 and the crown gear 210 are connected by the same two pulleys 213 respectively. When the hollow rod 205 is rotated by the worm gear 204, the belt 214 drives the hollow rod 205 and the crown gear 210 to rotate simultaneously. The inner wall of the protective box 1 is provided with a conveying mechanism 3.

[0030] The conveying mechanism 3 includes a second pulley 301, the outer wall of which is fixedly connected to the outer wall of the connecting shaft 202. The rotation of the connecting shaft 202 drives the second pulley 301 to rotate. A second belt 302 is drivenly connected to the inner wall of the second pulley 301. A third pulley 303 is drivenly connected to the outer wall of the end of the second belt 302 away from the second pulley 301. The second belt 302 connects the second pulley 301 and the third pulley 303. Therefore, when the second pulley 301 is driven to rotate by the connecting shaft 202, it drives the third pulley 303 to rotate simultaneously. A threaded rod 304 is fixedly connected to the outer wall of the third pulley 303. The outer wall of the threaded rod 304 is rotatably connected to the inner wall of the protective box 1. A slidable support is provided on the inner wall of the protective box 1. The bottom outer wall of the placement plate 307 is fixedly connected to several sliders 306. The inner wall of the sliders 306 is threadedly connected to the outer wall of the threaded rod 304. The rotation of the third pulley 303 drives the threaded rod 304 to rotate inside the protective box 1, which in turn drives the sliders 306 to move, thus moving the placement plate 307. The inner wall of the sliders 306 is slidably connected to the slide rod 305. The outer wall of the slide rod 305 is fixedly connected to the inner wall of the protective box 1. The sliders 306 on both sides of the placement plate 307 slide along the outer wall of the slide rod 305 to stabilize the movement of the placement plate 307 and prevent shaking. The top outer wall of the placement plate 307 is fixedly connected to several positioning rings 308. The outer walls of the positioning rings 308 are rotatably connected to positioning plates 309.

[0031] A gear-shaped knob 310 is rotatably connected to the top outer wall of the positioning ring 308. Rotating the positioning plate 309 away from the gear-shaped knob 310 allows the knob to rotate. The outer wall of the gear-shaped knob 310 engages with the outer wall of the positioning plate 309. A pressure spring 312 is fixedly connected to the inner wall of the positioning ring 308. A locking block 313 is fixedly connected to the outer wall of the end of the pressure spring 312 away from the positioning ring 308. The outer wall of the locking block 313 engages with the inner wall of the positioning plate 309. After the positioning plate 309 contacts the gear-shaped knob 310, the positioning plate 309 engages with the outer teeth of the gear-shaped knob 310. Simultaneously, the gear-shaped knob 310 pushes the locking block 313 to move, compressing the pressure spring 312 behind the locking block 313. The elasticity of the pressure spring 312 pushes the locking block 313, causing it to engage with the positioning plate 309. At this point, the gear-shaped knob 310... The knob cannot be rotated. A top protective plate 311 is fixedly connected to the top outer wall of the gear-shaped knob 310. Several positioning blocks 314 are fixedly connected to the inner wall of the gear-shaped knob 310. A push rod 315 is rotatably connected to the outer wall of the positioning blocks 314. A pressure plate 316 is fixedly connected to the outer wall of the end of the push rod 315 away from the positioning blocks 314. Rotating the gear-shaped knob 310 moves the positioning blocks 314 and drives the push rod 315 to move, which in turn pushes the pressure plate 316 to move. A limit groove 317 is provided on the inner wall of the push rod 315. A limit block 318 is slidably connected to the inner wall of the limit groove 317. The outer wall of the limit block 318 is fixedly connected to the inner wall of the positioning ring 308. By sliding the limit block 318 along the inside of the limit groove 317, the push rod 315 is pushed and the push rod 315 pushes the pressure plate 316, which then clamps the cover.

[0032] One specific application of this embodiment is:

[0033] When the operator needs to use the equipment, the material to be processed is placed in the positioning ring 308 through the discharge port 101. Then, the positioning plate 309 is pulled away from the gear-shaped knob 310, and the gear-shaped knob 310 is rotated, causing multiple positioning blocks 314 to move. The movement of the positioning blocks 314 pushes the push rod 315 to move. During the movement of the push rod 315, the limiting block 318 inside the positioning ring 308 slides along the limiting groove 317 inside the push rod 315. Since the length of the limiting block 318 is fixed, and the push rod 315 is arc-shaped, the limiting block 318 can push the push rod 315 to rotate around the positioning block 314. The rotation of the push rod 315 pushes the pressure plate 316 to move, thereby positioning the ring. The material inside 308 is clamped, and then the motor 201 is started to drive the connecting shaft 202 to rotate. The rotation of the connecting shaft 202 drives the second pulley 301 to rotate. Since the second pulley 301 is connected to the third pulley 303 at the other end through the second belt 302, the second pulley 301 and the third pulley 303 rotate simultaneously through the transmission of the second belt 302. The rotation of the third pulley 303 drives the threaded rod 304 to rotate inside the protective box 1. The rotation of the threaded rod 304 pushes the slider 306 to move towards the discharge port 102. During the movement of the slider 306, the placement plate 307 moves, thereby moving the multiple materials fixed at the bottom of the placement plate 307. During the movement, the sliders 306 on both sides of the placement plate 307 will slide along the outer wall of a sliding rod 305 to stabilize the movement of the placement plate 307 and prevent shaking. The placement plate 307 will move to the discharge port 102 for easy access. During the rotation of the connecting shaft 202, the worm 203 will rotate. Since the worm 203 meshes with the worm wheels 204 on both sides, the rotation of the worm 203 will drive the worm wheels 204 to rotate. During the rotation of the worm wheels 204, the hollow rod 205 will rotate inside the protective box 1. The hollow rod 205 drives the extension rod 207 to rotate, and the extension rod 207 extends to bring the connecting plate 208 closer to the placement plate 307. When the placement plate 307 moves with the unprocessed material to the positioning ring 308... When the material is at the bottom, because the area of ​​the positioning ring 308 is larger than that of the positioning plate 309 connected to its bottom, the positioning ring 308 will contact the top protective plate 311 on the top of the gear-shaped knob 310 first. This causes the top protective plate 311 to push the connecting plate 208 upward, thus pushing the extension rod 207 to move. The movement of the extension rod 207 compresses the spring 206 inside the hollow rod 205. The elasticity of the spring 206 pushes the extension rod 207 downward, allowing the grinding disc 209 at the bottom of the connecting plate 208 to come into close contact with the material. At this time, the grinding disc 209 can completely grind away the burrs on the surface of the material. The placement plate 307 will move to send the processed material to the bottom of the cleaning roller 212, whereby the cleaning roller 212 will wipe away the debris ground off the surface of the material.The rotation of the hollow rod 205 drives the pulley 213 to rotate. Simultaneously, the belt 214 inside the pulley 213, due to the rotation of the pulley 213, drives the other pulley 213 to rotate. This, in turn, drives the crown gear 210 to rotate. Since the crown gear 210 meshes with gear 211, the rotation of the crown gear 210 drives the gear 211 to rotate, which in turn drives the cleaning roller 212 to rotate, thus allowing the cleaning roller 212 to better clean the materials.

[0034] In the description of this specification, references to terms such as "an embodiment," "example," "specific example," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0035] The preferred embodiments of this utility model disclosed above are merely illustrative of the present utility model. These preferred embodiments do not exhaustively describe all details, nor do they limit the utility model to the specific implementations described. Clearly, many modifications and variations can be made based on the content of this specification. This specification selects and specifically describes these embodiments to better explain the principles and practical applications of this utility model, thereby enabling those skilled in the art to better understand and utilize it. This utility model is limited only by the claims and their full scope and equivalents.

Claims

1. A polishing device for projector lens cover processing, comprising a protective box (1), characterized in that: The inner wall of the protective box (1) is provided with a feeding port (101) and a discharging port (102). The inner wall of the protective box (1) is provided with a grinding mechanism (2). The grinding mechanism (2) includes a motor (201). The outer wall of the motor (201) is fixedly connected to the inner wall of the protective box (1). The output end of the motor (201) is fixedly connected to a connecting shaft (202) through a coupling. A worm gear (203) is fixedly connected to the outer wall of the connecting shaft (202) away from the motor (201). Several worm wheels (203) mesh with the outer wall of the worm gear (203). 04), a hollow rod (205) is fixedly connected to the top outer wall of several worm gears (204). The outer wall of the hollow rod (205) is rotatably connected to the inner wall of the protective box (1). A spring (206) is fixedly connected to the top of the inner wall of the hollow rod (205). An extension rod (207) is fixedly connected to the outer wall of the end of the spring (206) away from the hollow rod (205). The outer wall of the extension rod (207) is slidably connected to the inner wall of the hollow rod (205).

2. The polishing apparatus for processing a lens cover of a projector according to claim 1, wherein A connecting plate (208) is fixedly connected to the bottom outer wall of the extension rod (207), and a grinding disc (209) is fixedly connected to the bottom outer wall of the connecting plate (208). A crown gear (210) is rotatably connected to the inner wall of the protective box (1) away from the hollow rod (205). A gear (211) meshes with the outer wall of the crown gear (210). The outer wall of the gear (211) is rotatably connected to the inner wall of the protective box (1). A cleaning roller (212) is fixedly connected to the outer wall of the gear (211). A pulley (213) is fixedly connected to the outer walls of both the hollow rod (205) and the crown gear (210). A belt (214) is driven to the inner wall of the pulley (213). A conveying mechanism (3) is provided on the inner wall of the protective box (1).

3. The grinding device for processing a projector lens cover according to claim 2, characterized in that, The conveying mechanism (3) includes a second pulley (301), the outer wall of the second pulley (301) is fixedly connected to the outer wall of the connecting shaft (202), the inner wall of the second pulley (301) is connected to a second belt (302), and the outer wall of the end of the second belt (302) away from the second pulley (301) is connected to a third pulley (303).

4. The grinding device for processing a projector lens cover according to claim 3, characterized in that, The outer wall of the third pulley (303) is fixedly connected to a threaded rod (304), the outer wall of the threaded rod (304) is rotatably connected to the inner wall of the protective box (1), the inner wall of the protective box (1) is slidably connected to a placement plate (307), and the bottom outer wall of the placement plate (307) is fixedly connected to several sliders (306).

5. The grinding device for processing a projector lens cover according to claim 4, characterized in that, The inner wall of the slider (306) is threadedly connected to the outer wall of the threaded rod (304). The inner wall of the slider (306) is slidably connected to a slide rod (305). The outer wall of the slide rod (305) is fixedly connected to the inner wall of the protective box (1). The top outer wall of the placement plate (307) is fixedly connected to several positioning rings (308). The outer walls of the several positioning rings (308) are rotatably connected to positioning plates (309).

6. The grinding device for processing a projector lens cover according to claim 5, characterized in that, A gear-shaped knob (310) is rotatably connected to the top outer wall of the positioning ring (308). The outer wall of the gear-shaped knob (310) is engaged with the outer wall of the positioning plate (309). A pressure spring (312) is fixedly connected to the inner wall of the positioning ring (308). A locking block (313) is fixedly connected to the outer wall of the end of the pressure spring (312) away from the positioning ring (308). The outer wall of the locking block (313) is engaged with the inner wall of the positioning plate (309).

7. The grinding device for processing a projector lens cover according to claim 6, characterized in that, A top protective plate (311) is fixedly connected to the top outer wall of the gear-shaped knob (310). Several positioning blocks (314) are fixedly connected to the inner wall of the gear-shaped knob (310). A push rod (315) is rotatably connected to the outer wall of the several positioning blocks (314). A pressure plate (316) is fixedly connected to the outer wall of the end of the push rod (315) away from the positioning block (314).

8. The grinding device for processing a projector lens cover according to claim 7, characterized in that, The inner wall of the push rod (315) has a limiting groove (317), and the inner wall of the limiting groove (317) is slidably connected to a limiting block (318). The outer wall of the limiting block (318) is fixedly connected to the inner wall of the positioning ring (308).